---
title: "List custom WebMCP tools"
method: GET
path: "/webmcp/custom-tools"
---

# List custom WebMCP tools

`GET /webmcp/custom-tools`

Returns every registered custom tool with its generated ID, namespace, matcher, and MCP tool metadata.

## Response `200`

Current custom WebMCP tools.

- CustomWebMCPToolsResponse
  - `tools` CustomWebMCPDefinition[], required
    - `id` string, required
    - `namespace` string, required
    - `kind` string, required
    - `match` CustomWebMCPMatch, required
      - `url_patterns` string[], required
    - `tool` WebMCPToolMetadata, required — Tool metadata follows the [MCP Tool definition](https://modelcontextprotocol.io/specification/2025-11-25/server/tools#tool) and the [WebMCP RegisteredTool definition](https://webmachinelearning.github.io/webmcp/#dictdef-registeredtool). outputSchema is optional for page and custom tools.
      - `name` string, required
      - `title` string
      - `description` string, required
      - `inputSchema` object, required
      - `outputSchema` object
      - `annotations` WebMCPToolAnnotations — Tool-provided behavioral hints from the [MCP tool specification](https://modelcontextprotocol.io/specification/2025-11-25/server/tools#tool) and the [WebMCP ToolAnnotations definition](https://webmachinelearning.github.io/webmcp/#dictdef-toolannotations). These hints are untrusted and are not enforced by Kernel.
        - `readOnlyHint` boolean
        - `destructiveHint` boolean
        - `idempotentHint` boolean
        - `openWorldHint` boolean
        - `consequentialHint` boolean
        - `untrustedContentHint` boolean
        - `autosubmit` boolean

## Other responses

- `500` — Internal Server Error

## Changes

- **2026-09-23** `20deed4d1ac2` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/kernel/apis/kernel-images-api/changes/webmcp/custom-tools/get.md)

---

[API](https://skmtc.dev/kernel/apis/kernel-images-api.md) · [All operations](https://skmtc.dev/kernel/apis/kernel-images-api/llms.txt) · [OpenAPI document](https://skmtc.dev/kernel/apis/kernel-images-api/revisions/a1c46fb41d0f?raw)